Does the induction cooker get hot? Functions of induction hobs. 27 am - Installation of induction cookers

Collect a high harvest of positive emotions and save money financial resources– this is the primary goal of a person arranging a kitchen space.

Induction cookers are gaining popularity among our fellow citizens, thanks to their competitive advantages and distinctive properties from other types of slabs.

Operating principle

How does this type of stove work? The whole process goes like this:

1. The glass or glass-ceramic hob hides underneath a coil consisting of copper wire.
2. When electricity passes through the turns of the coil, it creates a high-frequency electromagnetic field, which further produces an induced current.
3. A utensil with magnetic permeability placed on the hob closes the circuit, acting as a kind of conductor.
4. The electrons in the bottom of the dish begin to actively move, thereby generating thermal energy that heats the contents of the container.

We figured out how induction cookers work. What are they like relative to their sizes?

Tabletop and built-in stoves

In order not to complain that a huge stove eats up useful space in the kitchen, you can purchase a tabletop stove.

Household appliances that do not take up much space will allow you to prepare your favorite dishes with the same speed and efficiency. Compact induction cookers are ideal for a small kitchen or cottage.

Manufacturers suggest choosing tabletop tiles with one or two burners. Such a device will completely satisfy the household needs of the average person.

This is often professional kitchen appliances for restaurants, cafes and other establishments where you need to cook a lot. Has high performance. In most cases, it has four burners with a lot of temperature regulators, timers and other operational advantages.

You can install such a stove at home, if finances allow, because it costs more than a small tabletop induction stove.

What kind of cookware can I use?

Before purchasing a new induction cooker, you need to learn about the features of its operation. The choice of pots and pans will now be more scrupulous than for the usual electric and gas cookers.

This is all explained by the fact that not every material reacts to the electromagnetic field, which sets in motion the electrons in the bottom of the dish.

In many people wanting to buy tiles that work on the basis electromagnetic induction The question often arises: is it possible to keep old cookware for cooking food?

Ceramic pots, aluminum frying pans and other containers are not suitable for induction panels. Only use metal utensils. It’s very easy to check which containers are suitable for cooking food.

You need to take a magnet and try to attach it to the container. If the magnet sticks, the cookware is ideal for use on induction hobs.

The most suitable cookware for induction cookers is made from stainless steel or cast iron. Let's look at the materials in more detail:

• Stainless steel.

The material is resistant to corrosion and oxidation. Food products, prepared in stainless steel containers retain the lion's share of nutrients.

Such dishes can be placed in the refrigerator. It will not change the taste and aroma of food.

From the refrigerator, the stainless steel is immediately placed on the induction cooker. The only drawback of this material is the nickel content, which causes an allergic reaction in some people.

• Enameled cookware is made from various metal alloys.

Suitable for induction cooking surfaces. It is better to buy saucepans with a flat bottom.

• Cast iron.

Although this material is heavy and fragile, it is often used for cooking on induction cookers.

It is also indispensable for people who prefer healthy eating, because this material does not distort the taste characteristics of food, and also allows you to preserve the maximum amount useful elements in cooked food.

How to determine whether a particular kitchen utensil is suitable for use on an induction hob?

One more small addition. The sides and lids of kitchen utensils do not have to be made of materials that react to magnetic waves.

Nowadays, manufacturers often equip the bottom of ceramic, copper cookware and cooking containers made of other materials with a special lining made of ferromagnetic metal. These kitchen utensils can be used on induction cookers.

Here are some practical tips to help you get the most out of your induction hobs:

• Although manufacturers of modern kitchen utensils are increasingly improving their products, making them suitable for use in different conditions and on different heating elements, but old cast iron cookware should not be thrown into a landfill. After purchasing an induction cooker, you can safely take it out of the pantry - it will last for many more years.
• Special cookware for induction surfaces is ideal for use on other heating elements: gas and electric.
• Old pots and pans that have passed magnetic testing should not be placed on the induction hob immediately. It is necessary to check the condition of the bottom. It may have irregularities and defects from mechanical damage, which can scratch the glass-ceramic surface of the new stove. A bent bottom may prevent the bottom of the container from making proper contact with the induction surface.

Advantages

This technology is relatively new, so it has a whole string of advantages. An induction cooker has the following advantages.

Built in day by day household appliances, including the kitchen, is being improved. Nowadays it is no longer possible to surprise anyone with such a device as a modern induction cooker. Electronic unit with the stove control turns on and controls the operation of the burner in accordance with special program. The most modern models are equipped with infrared sensors that monitor the temperature of the dishes and can reduce the heating power when the required temperature is reached.

Inverter cooker or induction panel: advantages of the device

In appearance, this kitchen appliance is practically no different from a simple electric stove, which has a ceramic surface and touch controls. But the first impression is always deceiving, and an inverter, also known as an induction cooker, is a high-tech modern device that works due to the action of electricity. magnetic field.

An inverter cooker is a device that allows you to start cooking in the most unusual conditions. Equipped the latest technologies and sensors, it becomes an excellent assistant to a person.

Like anything new, all the advantages of the product have not yet been fully appreciated by users, but the main ones can already be noted.

Pros of an induction cooker:

1. Economical. The stove begins to heat up only after installing the cookware from the right material, and the corresponding diameter onto the panel surface.
2. Safety. If you carelessly place a knife or fork on the stove, you will not get burned when you pick up the appliance again. The burner near the hot container remains cold.
3. Touch control. The stove has many modes that make cooking easier.
4. Fast cooking. Compared to a gas and conventional electric stove, the induction analogue spends much less time on cooking.
5. Easy to care for. The surface does not heat up, which means you can easily clean up ingredients accidentally spilled on the stove.

In addition, some models of inverter cookers are quite small in size, and they can be easily transported with you on vacation.

The principle of operation of an induction cooker: features of the device

Under the panel there is an induction coil that generates an electromagnetic high-frequency field. The frequency for heating occurs in the cookware itself, and not from the glass-ceramic surface.

The principle of operation of an induction cooker is the effect of inductors on objects or liquid placed in a container. This process is different from cooking on a regular stove, where food is cooked using heat transferred from the stove through the pan to the food.

The principle of operation of the induction panel is that it begins heat treatment of food only after placing a container with a dish on it. It should be noted that after you remove the cookware from the burner, this stove automatically turns itself off and cools down. This happens quickly, in just 6 minutes. To do right choice When buying an induction cooker, you first need to decide on your desires and the purpose of purchasing it.

1. Size. In some cases, home owners have to rearrange their kitchen after purchasing a new stove, because the new panel should not touch metal appliances. If contact cannot be avoided, then special protective material is laid between the objects.
2. The number of switching modes in the product. There are dishes that require a certain temperature to cook. The installation depends on the degree of intermediate positions desired temperature. It is recommended to take plates with 15-17 different switching modes.
3. Availability of spherical burners. If you are a lover of Asian cuisine, this option will be an advantage. To prepare oriental cuisine, dishes of a special concave shape are often used.
4. The ability to use all burners simultaneously with different cooking modes also significantly influences the choice if there are many people in the house, or all family members have their own preferences. In some models, it is possible to set only one particular mode for the entire stove.
5. Reviews and reviews on forums on the Internet regarding the selected model. If you have already decided on the choice of a brand, then you need to ask what users who have already bought it and tried it think about this device.

Housewives who are interested in how to choose an inverter hob must follow all of the above rules. Do not forget that not all electrical appliances can be placed under this device. If you this question concerned, you should consult with the person involved in the installation of such household appliances.

Convenient induction hob: disadvantages of use

All the pros and cons of the inverter panel are related to specific features work. This device is attributed to shortcomings without knowing the operating principle at all.

An induction hob, the disadvantages of which are that, due to the heating principle, such an induction cooker can only work correctly with cookware whose bottom is made of a ferrimagnetic alloy.

Before starting work, the smart surface automatically tests the kitchen utensils that were placed on it for compatibility, and only if everything matches, it switches to the heating mode. You can also determine the suitability of cookware using an ordinary magnet. Actually, in order to cook on an induction hob, it is not necessary to change all the containers in the house. The necessary special steel disks, made in the form of stands, are available on sale to solve this problem.

Disadvantages of an induction electric stove:

1. High degree electromagnetic radiation greatly affects health. When using, you need to be no closer than 15-20 cm from the product.
2. A loud noise is heard during the cooking process. Modern models They are already much quieter, and to further reduce the strong sound, you need tightly sealed containers.
3. For the stove you need to have the appropriate kitchen utensils. If you have to buy dishes, then choose them with a diameter larger than 12-13 cm, and check that they attract a magnet.
4. Great price. The cost of these devices is an order of magnitude higher than their analogues without induction. The difference will be somewhere around 3-5 thousand rubles.

Despite sufficient quantity The invention still has many more disadvantages and positive qualities.

How to turn on an induction cooker: what can interfere with operation

As already mentioned, the injection plate selects the heating area exactly according to the diameter of the bottom of the container that is placed on it. If the dishes chosen by a person do not cover at least 70% of the burner area, then the smart stove will not turn on, and it will automatically block the heating of products with a diameter of up to 12 cm. This is unlikely to suit those who like to brew quick Turkish coffee in the morning.

Not everyone who decides to make such a purchase knows how to turn on an induction cooker. And this sometimes makes big adjustments to the situation and life of household members. Before purchasing such a product, you need to learn as much as possible about it and carefully approach the choice.

This stove makes the cooking process safe, as there is no open flame on the surface. It doesn't have hot burners either. It turns on when a dish in a suitable container is placed on it. If there are other dishes on the stove, or the stove is empty, its device is programmed to automatically turn off. In addition, the stoves have built-in timers that signal to turn off at the right time. This avoids food overheating and burning.

To avoid any trouble with you and your new device, you need to follow several rules:

• Make the right choice. Approach this process wisely and first draw up an approximate portrait of your future inverter stove in accordance with the requirements that you have.
• Ask the seller for a quality certificate and warranty for this product.
• Use this device only in accordance with the operating instructions.
• Don't experiment with the stove.

If a malfunction is detected, immediately call a technician or transport the device to the workshop yourself. The use of faulty electrical appliances is prohibited.

Induction hob: what it is and how to use it

An induction hob is the same electric stove, only inductive, which works on a different principle. It is much easier and safer to use than a conventional electric or gas stove. It does not burn the owner’s hands with fire, and when used, the smell of burning does not spread throughout the room. Its efficiency is much higher than that of a conventional electric stove.

The fundamental difference between this plate and its conventional counterparts is that the new plate is interactive. All control elements are built into its touch panel, and working induction is triggered only in strictly specified cases.

You should be aware that the operation of the heating elements of such a stove can cause malfunctions in the operation of other devices. Manufacturers prohibit placing this built-in induction hob next to appliances with a metal casing.

Appliances that should not be placed near the induction hob:

• Oven;
• Microwave oven;
• Dishwasher;
• Geyser;
• Convection system;
• Inertial surface.

For the same reason, you cannot place objects with magnetic information, such as electronic passes, near such stoves. plastic cards, biometric passports. A magnetic system can simply destroy all data.

If the induction hob breaks: what to do

The main advantages of this stove are that it is of very high quality and practical. Induction household appliances cannot be counterfeited, and this is their advantage. If their electronic circuit can be faked, then in order for the stove to work efficiently, special equipment is needed.

Induction hob, electronic circuit which has failed can only be repaired in specialized workshops. Do not attempt to make repairs yourself.

If the convector system does not work, it is also not recommended to carry out repairs yourself. The reasons for the breakdown can be different, and only a specialist can figure them out. If your stove hums very constantly or intermittently, then try to find out whether such facts are inherent directly in this model. Perhaps this is how the panel is designed. If this sound appears suddenly, then you should be wary.

If a malfunction is detected, the device must:

• Turn off;
• Let cool;
• Call a technician or transport the device yourself.

Only a qualified specialist will be able to see the real picture of the state of affairs.

How to use an induction cooker (video)

It doesn't matter why you decided to purchase of this device, the important thing is that you don’t stop after taking the first step and go all the way to the end. Once you install a new assistant in your home, you will definitely be satisfied with its work.

Attention, TODAY only!

Every year more and more high-tech new products appear among household appliances. All of them are designed to make a person’s life more comfortable, minimizing unnecessary worries and hassle. One of the brightest representatives of “smart technology” is the induction cooker, which appeared on Russian market relatively recently, but has already fallen in love with many cooks. However, not all consumers make their choice in favor of technological innovations, preferring traditional electric or gas stoves. Obviously, there are pros and cons of induction cookers that need to be considered in more detail.

Induction cooker: operating principle

An induction hob is a type electric model. Only, unlike traditional models, it does not contain a heating element, but an induction coil through which an electric current passes with a frequency of 20 to 100 kHz. By passing a high-frequency current, the coil creates a field, under the influence of which the metal utensils and then the food heat up.

Externally, an induction hob looks exactly the same as a classic one. It consists of a body with glass ceramic surface, under which the induction coil is hidden. There are no protruding “pancakes” on it as such; the surface of the hob is perfectly smooth. The boundaries of the burner are marked with lines that allow you to determine where to place the cookware. Depending on the model, the panel may contain the usual 4 burners of different diameters, or 2 of the 4 can be combined into one. This is very convenient if you need to cook food in a rectangular saucepan. There are also mini-tabletop versions with one burner.

Induction hob - the pros and cons of a high-tech new product should be considered at the purchase planning stage. After all, like any modern household appliance, it has its advantages and disadvantages.

Advantages of electric induction cookers

Below are the main points due to which consumers make their choice in favor of induction cookers.

Work efficiency

Thanks to the conducted research, we can conclude that the efficiency indicator of induction cookers is the highest. For example, the efficiency when heating an electric stove is no more than 30%, for a gas model - 60%, for an induction panel the figure reaches 90%. This means that compared to traditional stoves, cooking time is reduced by 15–20 minutes. The cookware heats up much faster; this feature will appeal most to cooks who prefer to cook complex Asian dishes; it is known that they require instant and short-term heating, and the stove imitates cooking over an open fire.

Safety

Considering the pros and cons of an induction cooker, special attention You should pay attention to its safety in use. Although the burner quickly heats the pan, the surface of the hob does not heat up. Now if small child left in the kitchen unattended, you don’t have to worry about getting burned by touching the stove. However, this does not mean that parents can leave their children unattended in the kitchen while cooking - the dishes and food in them will be just as hot as on a classic stove. The second feature that allows us to call the product safe is that the stove functions only if there is a cookware on the burner. When you remove it from the surface, the burner automatically turns off. Besides, " smart system» does not heat objects whose diameter is less than 12 cm, this prevents metal cutlery accidentally left on the surface from heating up.

Easy to use

Among the pros and cons of an induction cooker, the undoubted advantage is ease of use. Unlike classic models, an induction cooker is equipped with various cooking programs, which allows even a novice cook to complete complex dishes without much difficulty. Due to the fact that it is not the stove that heats up, but only the dishes, caring for the surface of the cabinet becomes incredibly simple. After all, food that gets on the stove during cooking does not burn, so it can be easily removed with a dry or damp cloth.

Energy Saving

Compared to a traditional electric stove, the energy consumption of an induction panel is significantly lower. Curious ordinary people conducted an experiment that clearly confirms this fact. If on a classic electric stove two liters of water in a pan boils after 30 minutes, then on an induction stove it will boil after 5 minutes 30 seconds. In both cases, the power of the tested burners was 3.5 kW.

Stylish and modern design

Perhaps an interesting design is the main advantage among the pros and cons of induction cookers, if the buyer values ​​not only quality and comfort, but also attractive appearance. The hob, made in an ultra-modern style, will organically fit into the kitchen interior, decorated in a techno or high-tech direction.

Disadvantages of induction cookers

Having considered the advantages of induction models, it remains to pay attention to their disadvantages. There are much fewer of them, but they all deserve close attention from a potential buyer.

Cost of induction cooker and cookware

Obviously, only consumers with above-average income can afford to purchase an induction cooker. For example, you can consider the cost of a tabletop hob with one burner. An electric stove with a heating element can be purchased for 500–700 rubles, while the cost of a budget induction model will be at least 3,500 rubles. In addition, for the operation of induction burners, metal cookware with magnetic properties and a perfectly flat bottom is required. You can use the usual stainless steel pans, but most often you have to purchase a special set of cookware along with the stove.

Difficulty in installation and placement

An interesting design is both a plus and a minus of an induction cooker. The fact is that the hob cannot be placed above a classic oven or washing machine, as well as other household appliances with a metal body. During operation, care should be taken, since the hob is quite fragile; impacts may cause chips or cracks on it.

The cooking mode for some dishes is not well thought out

Many consumers who have purchased an induction cooker complain that it is completely unsuitable for preparing dishes that require long cooking times. For example, jam or jellied meat. The “smart” device automatically turns off after 3 hours, and this time is not enough for cooks.

Having considered the pros and cons of an induction cooker, it remains to find out its effect on human health; there are many myths and guesses about this among ordinary people. Manufacturers claim that the electromagnetic field does not have any effect negative influence on human health and the stove can be recommended even for people with implanted pacemakers. However, experts advise such people not to take risks and, before purchasing, to consult with a representative of the company that produces the product and their doctor.

Video about the advantages and disadvantages of induction cookers

08:27 am - Installation of induction cookers.

Summarized tile diagrams 4home, redber, alaska and pdf from samsung, holtek, fairchild and onsemiconductor.

1. Theory.
Heating occurs due to the magnetization reversal of the ferromagnet, and not the Foucault/Eddie/eddy currents in the frying pan, because when using only Foucault currents, it will be released in the stove itself more heat or the design will be very complex with copper tubes. Everything written below is taken from pdf onsemiconductor, holtek and fairchild. I haven’t tested it in practice, so I could be mistaken. Simplified diagram of an induction cooker.



Cbus - capacitor for stabilizing the supply voltage during one period of the oscillatory process, 4...8 μF;
Cr - resonant capacitor, 0.2...0.3 µF;
Lr - inductor, 100 μH;
T1/D1 - IGBT type IHW20N120R2, FGA15N120ANTD, IRGP20B120UD (Vces=1200V/Ic=15A/Toff+Tf=400nC/Vsat=1.6 V).

I have shown what processes are taking place on this graph.

The operating cycle consists of two large stages: charging the inductor with a linearly increasing current through an open transistor/diode and a damped oscillatory process with the transistor closed. Which can be divided into several small cycles.

1. Damped oscillatory process with a closed transistor. The initial state here is always the same: Cr is charged to the Ubas level, because it is always, instantly, charged to the Ubas level when the IGBT is opened.
1. Cr is discharged to the inductor: the current through the inductor and the voltage at the IGBT collector increases to Ubas, because Uce=Ubas-Ucr.
2. The inductor discharges to Cr: the current through the inductor decreases, and the voltage at the IGBT collector increases to the maximum possible meaning. This value is proportional to the time the transistor is on.
3. Cr is discharged at Lr to voltage Ubas: The inductor current increases, and the IGBT collector voltage drops to 0. When the collector voltage drops below zero, the IGBT counter diode opens.
2. Linear process of pumping an inductor. The initial state here is always the same: Cr is charged to the Ubas level, because at this charge level the voltage on the counter diode passes through zero. If the unlocking pulse arrives at the gate of the transistor before the unlocking of the diode or when the diode is already closed, i.e., the resonant capacitor is not charged to Ubus or is already discharged to the inductor, then at the initial moment of time it will pass through the transistor higher current and it will get very hot. Which will have a bad effect on reliability. At this stage, Cr is always charged to the Ubas level and the collector voltage is close to 0.
   1. The inductor current passes through the counter diode: The current through the inductor drops linearly to zero. At this optimal time, apply an unlocking pulse to the gate.
   2. The inductor current flows through the IGBT: The current through the inductor increases linearly. At this time, it is necessary to close the transistor in time so that the inductor does not accumulate enough energy to breakdown the transistor at cycle 1.2.

Consequences.

1. Power is regulated by changing the duration of a burst of pulses, because PSD is difficult to regulate: the moment the transistor turns on is determined by the transition through zero of the collector voltage, and the moment it turns off is determined by the maximum possible voltage on the collector, that is, the frequency and duty cycle are related by an inverse relationship and they regulate the power in a simple way it won't work out.
2. If there are no dishes on the stove, this may damage the transistor due to an increase in the maximum voltage (Cr will charge to higher voltage). To prevent this, every two seconds a procedure is carried out to control the presence of a frying pan: a seed pulse is applied, and then they count how many cycles the oscillatory process will decay. If more than 3, it means there are no dishes and you need to turn off the stove.
3. The heaviest is the first pulse, because then Cr is charged through the IGBT.

2. Power circuit.



Purpose of elements:
Li - a ferrite torus, placed on a network wire, serves to suppress common-mode interference. In most cases there is none;
FUSE - fuse;
C1 is a pulse noise filtering capacitor, in most cases it is not present;
R1 - resistor for discharging C1 after power off;
D1, D2 - rectifier for SMPS and network voltage control (for calculating power and overvoltage protection);
RJ - shunt in the form of a piece of thick wire;
L1 - impulse noise filter, most often there is none;
C2 - capacitor for the possibility of energy return oscillatory circuit with inductor in intermediate circuit DC Ubas;
C3 is a resonant capacitor, needed to ensure continuous current after the transistor is turned off;
Lr1 - inductor, serves to transfer energy to the dishes;
T1 - IGBT transistor, needed to convert direct current to alternating current;
R2 is a resistor designed to ensure that the transistor is in a locked state after switching on;
R3 is a resistor designed to suppress high-frequency current at the gate;
Uoutlet - rectified voltage in the network;
Ush - current control for overload protection;
Uce - voltage control on the IGBT collector, serves as overvoltage protection and, together with Ubas, determines the moment the IGBT is turned on;
Ubus - used to determine when the IGBT is turned on.

I described the theory of work earlier, so I won’t repeat myself.

3. Driver.



Purpose of elements:
D2 - does not allow 18V to sag when decreasing 18V at the SMPS output; instead of a diode there may be a 51 Ohm resistor or nothing at all;
C2 - driver supply voltage stabilization, may not be present;
R3, T4, R2, T3 - two amplification stages with a common emitter;
T1 and T2 - collector repeater;
D1 - prevents the output voltage from rising above 18V;
R1 - limits the IGBT gate charge current;
R5 - increases input impedance driver, necessary to protect the controller output;
R4 - serves to channel leakage current T4;
C1 - speeds up the switching process T4.

4. Source Switching Power 5 and 18 Volts.
They are made according to two schemes: a flyback converter and a forward converter. In both cases, the same components are used: PWM chip (PWM/PWM with a built-in switch, most often Viper12A), 78L05, transformer, resistors and capacitors.

In both schemes, S1 is a thermal fuse resting on the heat-resistant tile cover. Often it does not exist; R1 - serves for filtering (judging by the diagram in the Samsung datasheet: instead of a resistor there is a 300 µH inductor) or as a fuse (as written by stm).

4.1. Flyback converter.

4.2 Double Output Buck Converter based on the same elements.

The circuit is copied from STM (AN1514, page 3), and is used in Alaska ic1800 up to the nominal values. .



Several circuits from AN1514.

5. Voltage control on the inductor.
Despite the fact that the IGBT must be opened when the collector voltage (Uce) is slightly below zero (when the freewheeling diode built into it is open), this point in time is determined not by this voltage crossing zero, but by comparing it with the DC intermediate circuit voltage (Ubus), followed by a delay. The voltages are compared in a comparator built into the control chip.
This comparator is also used to determine the presence of a frying pan: once every 2 seconds the IGBT opens for 1 mS, and then the oscillations are counted until they are completely attenuated; if there are more than 3...24 of them, then there is no frying pan on the tile. Therefore, two dividers are used here, which bring input voltages of about 1200V to values ​​​​less than 5V (supply voltage of the control chip).
Additionally, the voltage on the collector is supplied to the analog input of the control ms for overvoltage protection. Therefore, this voltage is divided by another 1.5-3 times. Although this additional divisor may not exist.
Since a voltage of 1200V will break through any single resistor, in the upper arms of the divider they use 2 or 3 series-connected resistors of 1-2 W, but since Ubas cannot be much more than 300V, then in the upper arm of the divider there is Ubus with one or two resistors they bet less. At the output of the dividers, in series with the ic inputs there can be a 100-39000 Ohm resistor; they are probably needed for additional noise filtering. The result is the following diagram.

6. Network voltage control.
In principle, this is the same as Ubus, but measured before the rectifier. Used for power metering and overvoltage protection. For both purposes, different voltage dividers are used: the output of one divider goes to the input of the ADC, and the other to the input of the comparator. The divider circuits are similar to the previous ones. Only the voltage at the ADC input is strongly averaged by the capacitor large capacity.



To save one large resistor, they can supply constant voltage supply from the divider connected to the ADC through a small resistor (this voltage is obviously less than 5V), and the variable through a capacitor.

7. Current control.
To control the current, an operational amplifier built into the control chip is used. That is, this circuit requires two outputs: the input of the op-amp and its output. Some tiles also use a built-in comparator for current protection. The diagram is clear without explanation.

8. Igbt temperature control.
Under the igbt, using an elastic band, the thermistor is pressed tightly. It is needed to control the temperature of the igbt.

The circuit is a regular voltage divider, in one arm of which there is an NTC thermistor of type 3950-100k.

Recommended Samsung control logic:
-temperature above 85° - reduce power;
- temperature above 90° - turn off the stove.

9. Surface temperature control.
The circuit is identical to the previous one, only the thermistor is pressed to the surface of the stove. Where is the thermistor located?

10. Tweeter and fan.
They can be controlled from separate outputs of the control chip, but in lately They are connected to one output, but the tweeter is connected through a capacitor. Moreover, the other output of the tweeter can be connected to any voltage: 0V, 5V or 18V.

11. Other design options.
1. Circuit based on a thyristor with voltage resonance. Although it is simpler than this one, it is more reliable (no need to worry about the moment the thyristor turns off), more expensive (the resonant capacitor has a capacity 10 times larger) and heavier (the capacitors will be heavier). Now it cannot be implemented, because the industry has stopped producing inverter thyristors en masse.



2. Half-bridge resonant inverter, offered by STM.